How can I set the value of ASP Controls using JavaScript

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I have two ASP Controls. One is Text Box and another is ComboBox.

ASP.NET

<asp:TextBox ID="txtName" runat="server"></asp:TextBox>
    <asp:DropDownList ID="ddlCountry" runat="server"></asp:DropDownList>

Now I like to set the value of TextBox and Get the selected index of dropDown list using JavaScript.

How can I do these in Java Script?

Posted 1-Jan-12 23:19pm

Jyoti Choudhury

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Ankur^\m/ · Answer 1 · 2012-01-01T23:35:00

This is JavaScript basics. Here is how you will do it:
Set textbox value -

JavaScript

document.getElementById("txtName").value = "somevalue";

Get the selected index of dropDown -

JavaScript

var index = document.getElementById("ddlCountry").selectedIndex

BTW doing this in jQuery will reduce writing code more. Here's how you do the same thing in jQuery -

JavaScript

$("#txtName").val("somevalue");
var index = $("#ddlCountry").prop("selectedIndex");

Sarvesh Kumar Gupta · Answer 2 · 2012-01-01T23:47:00

Solution 2

Hi, Use below code

For Text Box - Set value

document.getElementById('<%=txtName.ClientID%>').value = "somevalue";

Get the selected index of dropDown

var index = document.getElementById('<%=ddlCountry.ClientID%>').selectedIndex

Posted 1-Jan-12 23:47pm

Sarvesh Kumar Gupta

Updated 2-Jan-12 0:43am

v2

Comments

Jyoti Choudhury 2-Jan-12 5:58am

thanks a lot. but I dont know why, it is not working in VS2008. I am not getting the value property in the list. I tried these solutions but nothing popped out.

amit28august · Answer 3 · 2012-01-01T23:50:00

XML

<script type="text/javascript">

    function getValue(x)
{
var y= x.value;
document.getElementById('txtName').value =y;

alert(y);
}
    </script>

Use this Script to do work

XML

<asp:TextBox ID="txtName" runat="server"></asp:TextBox>
   <asp:DropDownList ID="ddlCountry"  onchange ="getValue(this);"  runat="server">
   <asp:ListItem >asds</asp:ListItem>
   <asp:ListItem >asrtyrtds</asp:ListItem>
   <asp:ListItem >asyrtyrtyds</asp:ListItem>
   </asp:DropDownList>

How can I set the value of ASP Controls using JavaScript

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